Both cerebral hemispheres are essential for proper body...

Both cerebral hemispheres are essential for proper body function. However, the left cerebral hemisphere controls the right side of the body, whereas the right cerebral hemisphere controls the left side of the body. Why is this the case? a. The descending neural connections are not switched in the brainstem, which means that the neural connections of the left hemisphere are transmitted to the right side of the body and vice versa. b. The ascending neural connections are not switched in the brainstem, which means that the neural connections of the left hemisphere are transmitted to the right side of the body and vice versa. c. The descending neural connections are switched in the brainstem, which means that the neural connections of the left hemisphere are transmitted to the right side of the body and vice versa. d. The ascending neural connections are switched in the brainstem, which means that the neural connections of the left hemisphere are transmitted to the right side of the body and vice versa.

Transcript

00:01 The human brain is made up of three main parts.

00:03 The first one, it is called as the cerebrum.

00:07 Cerebrum is the largest portion of the brain and it controls most of the body activities.

00:12 Next to it is the cerebellum.

00:15 Cerebellum is the second largest portion of the brain and it is involved in body balance.

00:20 The third part is the brain stem.

00:22 The brain stem is divided into three parts.

00:25 The first one, it is called as the midbrain.

00:28 And the second one it is called as the pawns and the third portion is called as the medulla obeloncata the medulla obelangata is the structure that will connect the brain to the spinal cord hence this one this is the part which has to be most taken care of and if it is observed the left portion of the brain it will control the right side of the body whereas the right portion of the brain will control the left side of the body.

00:55 So the reason behind this is that let's consider this to be the brain and this portion, this semicircle, let's call it as the left hemisphere.

01:05 Let's denote touch for hemisphere.

01:07 And the other semicircle, let's call it as the right hemisphere.

01:11 So let's say this point a to b and sensor again, such as the fingers.

01:17 When the signals are passed from the fingers, it will take up the contra latel path that is it will flow the neuron will travel like this and it will make a cross at the brain stem and it'll enter the right hemisphere whereas when it has to come back again from the brain it will take up the same path that is it will come here and the brain and in the brain stem it will make across and it will reach the sensor again a like in the case of b let's say b to be also a sensor again so the neuron will take up this path and at the brainstem it will make a cross and it will enter directly the left hemisphere and while coming again from the brain, it will take up the path and it will make a crossover here and it will reach the sense organ b.

01:58 So this path of making an x is called as the contra lateral pathway.

02:03 And this pathway is very, very easy in regard to neuronal signaling...

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